├── .gitignore ├── build.gradle ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat ├── settings.gradle └── src └── test ├── java ├── CreatingObservables.java ├── MultiCastingUsingConnectableObservables.java ├── MultiThreading.java ├── QuickIntroduction.java └── ResilienceTests.java └── resources └── logback.xml /.gitignore: -------------------------------------------------------------------------------- 1 | .idea 2 | .gradle 3 | build -------------------------------------------------------------------------------- /build.gradle: -------------------------------------------------------------------------------- 1 | group 'praveer09.experiments' 2 | version '1.0-SNAPSHOT' 3 | 4 | apply plugin: 'java' 5 | 6 | sourceCompatibility = 1.8 7 | targetCompatibility = 1.8 8 | 9 | ext { 10 | rxJavaVersion = '1.1.9' 11 | assertJVersion = '3.5.2' 12 | mockitoVersion = '1.10.19' 13 | logbackVersion = '1.1.7' 14 | jUnitVersion = '4.12' 15 | } 16 | 17 | repositories { 18 | mavenCentral() 19 | } 20 | 21 | dependencies { 22 | compile "io.reactivex:rxjava:$rxJavaVersion" 23 | compile "ch.qos.logback:logback-classic:$logbackVersion" 24 | 25 | testCompile("junit:junit:$jUnitVersion") { 26 | exclude group: 'org.hamcrest' 27 | } 28 | testCompile "org.assertj:assertj-core:$assertJVersion" 29 | testCompile "org.mockito:mockito-all:$mockitoVersion" 30 | } 31 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/praveer09/rxjava-examples/ecca1ffe66b85f420d0ab8af8c22a368bb4d39fb/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Sat Aug 27 15:20:31 IST 2016 2 | distributionBase=GRADLE_USER_HOME 3 | distributionPath=wrapper/dists 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | distributionUrl=https\://services.gradle.org/distributions/gradle-3.0-bin.zip 7 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | 3 | ############################################################################## 4 | ## 5 | ## Gradle start up script for UN*X 6 | ## 7 | ############################################################################## 8 | 9 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 10 | DEFAULT_JVM_OPTS="" 11 | 12 | APP_NAME="Gradle" 13 | APP_BASE_NAME=`basename "$0"` 14 | 15 | # Use the maximum available, or set MAX_FD != -1 to use that value. 16 | MAX_FD="maximum" 17 | 18 | warn ( ) { 19 | echo "$*" 20 | } 21 | 22 | die ( ) { 23 | echo 24 | echo "$*" 25 | echo 26 | exit 1 27 | } 28 | 29 | # OS specific support (must be 'true' or 'false'). 30 | cygwin=false 31 | msys=false 32 | darwin=false 33 | case "`uname`" in 34 | CYGWIN* ) 35 | cygwin=true 36 | ;; 37 | Darwin* ) 38 | darwin=true 39 | ;; 40 | MINGW* ) 41 | msys=true 42 | ;; 43 | esac 44 | 45 | # Attempt to set APP_HOME 46 | # Resolve links: $0 may be a link 47 | PRG="$0" 48 | # Need this for relative symlinks. 49 | while [ -h "$PRG" ] ; do 50 | ls=`ls -ld "$PRG"` 51 | link=`expr "$ls" : '.*-> \(.*\)$'` 52 | if expr "$link" : '/.*' > /dev/null; then 53 | PRG="$link" 54 | else 55 | PRG=`dirname "$PRG"`"/$link" 56 | fi 57 | done 58 | SAVED="`pwd`" 59 | cd "`dirname \"$PRG\"`/" >/dev/null 60 | APP_HOME="`pwd -P`" 61 | cd "$SAVED" >/dev/null 62 | 63 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 64 | 65 | # Determine the Java command to use to start the JVM. 66 | if [ -n "$JAVA_HOME" ] ; then 67 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 68 | # IBM's JDK on AIX uses strange locations for the executables 69 | JAVACMD="$JAVA_HOME/jre/sh/java" 70 | else 71 | JAVACMD="$JAVA_HOME/bin/java" 72 | fi 73 | if [ ! -x "$JAVACMD" ] ; then 74 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 75 | 76 | Please set the JAVA_HOME variable in your environment to match the 77 | location of your Java installation." 78 | fi 79 | else 80 | JAVACMD="java" 81 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 82 | 83 | Please set the JAVA_HOME variable in your environment to match the 84 | location of your Java installation." 85 | fi 86 | 87 | # Increase the maximum file descriptors if we can. 88 | if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then 89 | MAX_FD_LIMIT=`ulimit -H -n` 90 | if [ $? -eq 0 ] ; then 91 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 92 | MAX_FD="$MAX_FD_LIMIT" 93 | fi 94 | ulimit -n $MAX_FD 95 | if [ $? -ne 0 ] ; then 96 | warn "Could not set maximum file descriptor limit: $MAX_FD" 97 | fi 98 | else 99 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 100 | fi 101 | fi 102 | 103 | # For Darwin, add options to specify how the application appears in the dock 104 | if $darwin; then 105 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 106 | fi 107 | 108 | # For Cygwin, switch paths to Windows format before running java 109 | if $cygwin ; then 110 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 111 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 112 | JAVACMD=`cygpath --unix "$JAVACMD"` 113 | 114 | # We build the pattern for arguments to be converted via cygpath 115 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 116 | SEP="" 117 | for dir in $ROOTDIRSRAW ; do 118 | ROOTDIRS="$ROOTDIRS$SEP$dir" 119 | SEP="|" 120 | done 121 | OURCYGPATTERN="(^($ROOTDIRS))" 122 | # Add a user-defined pattern to the cygpath arguments 123 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 124 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 125 | fi 126 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 127 | i=0 128 | for arg in "$@" ; do 129 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 130 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 131 | 132 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 133 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 134 | else 135 | eval `echo args$i`="\"$arg\"" 136 | fi 137 | i=$((i+1)) 138 | done 139 | case $i in 140 | (0) set -- ;; 141 | (1) set -- "$args0" ;; 142 | (2) set -- "$args0" "$args1" ;; 143 | (3) set -- "$args0" "$args1" "$args2" ;; 144 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;; 145 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 146 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 147 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 148 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 149 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 150 | esac 151 | fi 152 | 153 | # Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules 154 | function splitJvmOpts() { 155 | JVM_OPTS=("$@") 156 | } 157 | eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS 158 | JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME" 159 | 160 | exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@" 161 | -------------------------------------------------------------------------------- /gradlew.bat: -------------------------------------------------------------------------------- 1 | @if "%DEBUG%" == "" @echo off 2 | @rem ########################################################################## 3 | @rem 4 | @rem Gradle startup script for Windows 5 | @rem 6 | @rem ########################################################################## 7 | 8 | @rem Set local scope for the variables with windows NT shell 9 | if "%OS%"=="Windows_NT" setlocal 10 | 11 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 12 | set DEFAULT_JVM_OPTS= 13 | 14 | set DIRNAME=%~dp0 15 | if "%DIRNAME%" == "" set DIRNAME=. 16 | set APP_BASE_NAME=%~n0 17 | set APP_HOME=%DIRNAME% 18 | 19 | @rem Find java.exe 20 | if defined JAVA_HOME goto findJavaFromJavaHome 21 | 22 | set JAVA_EXE=java.exe 23 | %JAVA_EXE% -version >NUL 2>&1 24 | if "%ERRORLEVEL%" == "0" goto init 25 | 26 | echo. 27 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 28 | echo. 29 | echo Please set the JAVA_HOME variable in your environment to match the 30 | echo location of your Java installation. 31 | 32 | goto fail 33 | 34 | :findJavaFromJavaHome 35 | set JAVA_HOME=%JAVA_HOME:"=% 36 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 37 | 38 | if exist "%JAVA_EXE%" goto init 39 | 40 | echo. 41 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 42 | echo. 43 | echo Please set the JAVA_HOME variable in your environment to match the 44 | echo location of your Java installation. 45 | 46 | goto fail 47 | 48 | :init 49 | @rem Get command-line arguments, handling Windows variants 50 | 51 | if not "%OS%" == "Windows_NT" goto win9xME_args 52 | if "%@eval[2+2]" == "4" goto 4NT_args 53 | 54 | :win9xME_args 55 | @rem Slurp the command line arguments. 56 | set CMD_LINE_ARGS= 57 | set _SKIP=2 58 | 59 | :win9xME_args_slurp 60 | if "x%~1" == "x" goto execute 61 | 62 | set CMD_LINE_ARGS=%* 63 | goto execute 64 | 65 | :4NT_args 66 | @rem Get arguments from the 4NT Shell from JP Software 67 | set CMD_LINE_ARGS=%$ 68 | 69 | :execute 70 | @rem Setup the command line 71 | 72 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 73 | 74 | @rem Execute Gradle 75 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% 76 | 77 | :end 78 | @rem End local scope for the variables with windows NT shell 79 | if "%ERRORLEVEL%"=="0" goto mainEnd 80 | 81 | :fail 82 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 83 | rem the _cmd.exe /c_ return code! 84 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 85 | exit /b 1 86 | 87 | :mainEnd 88 | if "%OS%"=="Windows_NT" endlocal 89 | 90 | :omega 91 | -------------------------------------------------------------------------------- /settings.gradle: -------------------------------------------------------------------------------- 1 | rootProject.name = 'rxjava-examples' 2 | 3 | -------------------------------------------------------------------------------- /src/test/java/CreatingObservables.java: -------------------------------------------------------------------------------- 1 | import org.junit.Test; 2 | import org.slf4j.Logger; 3 | import org.slf4j.LoggerFactory; 4 | import rx.Observable; 5 | import rx.Subscriber; 6 | import rx.observers.TestSubscriber; 7 | import rx.schedulers.Schedulers; 8 | 9 | import static java.util.concurrent.TimeUnit.MILLISECONDS; 10 | 11 | public class CreatingObservables { 12 | private static final Logger LOGGER = LoggerFactory.getLogger(CreatingObservables.class); 13 | 14 | @Test 15 | public void createUsingFromCallable() throws Exception { 16 | TestSubscriber testSubscriber = TestSubscriber.create(); 17 | 18 | Observable.fromCallable(() -> { 19 | Thread.sleep(2_000); 20 | LOGGER.info("Finished the callable"); 21 | return "done"; 22 | }).subscribeOn(Schedulers.newThread()).subscribe(testSubscriber); 23 | 24 | 25 | testSubscriber.awaitTerminalEvent(2_500, MILLISECONDS); 26 | testSubscriber.assertCompleted(); 27 | testSubscriber.assertValueCount(1); 28 | testSubscriber.assertValue("done"); 29 | } 30 | 31 | @Test 32 | public void createAnObservableOfRangeOfNumbers() throws Exception { 33 | TestSubscriber testSubscriber = TestSubscriber.create(); 34 | 35 | Observable.range(1, 100).subscribe(testSubscriber); 36 | 37 | testSubscriber.awaitTerminalEvent(); 38 | testSubscriber.assertCompleted(); 39 | testSubscriber.assertValueCount(100); 40 | } 41 | 42 | @Test 43 | public void createAnObservableThatEmitsInAnInterval() throws Exception { 44 | TestSubscriber testSubscriber = TestSubscriber.create(); 45 | 46 | Observable.interval(1, 500, MILLISECONDS).take(2_750, MILLISECONDS).subscribe(testSubscriber); 47 | 48 | testSubscriber.awaitTerminalEvent(3_000, MILLISECONDS); 49 | testSubscriber.assertCompleted(); 50 | testSubscriber.assertValueCount(6); 51 | } 52 | 53 | @Test 54 | public void createAnObservableUsingCreate() throws Exception { 55 | TestSubscriber testSubscriber = TestSubscriber.create(); 56 | 57 | Observable.create(new Observable.OnSubscribe() { 58 | @Override 59 | public void call(Subscriber subscriber) { 60 | for (int i = 0; i < 5; i++) { 61 | if (subscriber.isUnsubscribed()) return; 62 | int result = doSomeTimeTakingIoOperation(i); 63 | LOGGER.info("Value received is {}", result); 64 | 65 | if (subscriber.isUnsubscribed()) return; 66 | subscriber.onNext(result); 67 | } 68 | 69 | if (subscriber.isUnsubscribed()) return; 70 | 71 | subscriber.onCompleted(); 72 | } 73 | 74 | private int doSomeTimeTakingIoOperation(int i) { 75 | try { Thread.sleep(1_000); } catch (InterruptedException ignored) { } 76 | return i; 77 | } 78 | }).subscribeOn(Schedulers.io()).subscribe(testSubscriber); 79 | 80 | testSubscriber.awaitTerminalEventAndUnsubscribeOnTimeout(2_500, MILLISECONDS); 81 | testSubscriber.assertNotCompleted(); 82 | testSubscriber.assertValueCount(2); 83 | 84 | } 85 | } 86 | -------------------------------------------------------------------------------- /src/test/java/MultiCastingUsingConnectableObservables.java: -------------------------------------------------------------------------------- 1 | import org.junit.Test; 2 | import org.slf4j.Logger; 3 | import org.slf4j.LoggerFactory; 4 | import rx.Observable; 5 | import rx.observables.ConnectableObservable; 6 | import rx.observers.TestSubscriber; 7 | 8 | import java.time.Instant; 9 | 10 | import static org.assertj.core.api.Assertions.assertThat; 11 | import static rx.Observable.defer; 12 | import static rx.Observable.just; 13 | 14 | public class MultiCastingUsingConnectableObservables { 15 | private final Logger logger = LoggerFactory.getLogger(this.getClass().getName()); 16 | 17 | @Test 18 | public void doesNotStartEmittingEventsTillConnectIsCalled() throws Exception { 19 | TestSubscriber testSubscriber = TestSubscriber.create(); 20 | ConnectableObservable observable = just("test") 21 | .doOnNext(logger::info) 22 | .publish(); 23 | 24 | observable.subscribe(testSubscriber); 25 | 26 | testSubscriber.assertNoValues(); 27 | 28 | observable.connect(); 29 | testSubscriber.awaitTerminalEvent(); 30 | testSubscriber.assertValue("test"); 31 | } 32 | 33 | @Test 34 | public void multiCastsSameEventToMultipleSubscribers() throws Exception { 35 | TestSubscriber subscriber1 = TestSubscriber.create(); 36 | TestSubscriber subscriber2 = TestSubscriber.create(); 37 | 38 | ConnectableObservable observable = defer(() -> just(Instant.now())) 39 | .doOnNext(i -> logger.info(i.toString())) 40 | .publish(); 41 | 42 | observable.subscribe(subscriber1); 43 | observable.subscribe(subscriber2); 44 | 45 | observable.connect(); 46 | 47 | subscriber1.awaitTerminalEvent(); 48 | subscriber2.awaitTerminalEvent(); 49 | 50 | assertThat(subscriber1.getOnNextEvents()) 51 | .containsExactlyElementsOf(subscriber2.getOnNextEvents()); 52 | } 53 | 54 | @Test 55 | public void connectHasToBeCalledAgainToRestartAfterCompleted() throws Exception { 56 | TestSubscriber subscriber1 = TestSubscriber.create(); 57 | TestSubscriber subscriber2 = TestSubscriber.create(); 58 | 59 | ConnectableObservable observable = defer(() -> just(Instant.now())) 60 | .doOnNext(i -> logger.info(i.toString())) 61 | .publish(); 62 | 63 | observable.subscribe(subscriber1); 64 | observable.connect(); 65 | subscriber1.awaitTerminalEvent(); 66 | subscriber1.assertValueCount(1); 67 | 68 | observable.subscribe(subscriber2); 69 | observable.connect(); 70 | subscriber2.awaitTerminalEvent(); 71 | subscriber2.assertValueCount(1); 72 | 73 | assertThat(subscriber1.getOnNextEvents().get(0)) 74 | .isNotEqualTo(subscriber2.getOnNextEvents().get(0)); 75 | } 76 | 77 | @Test 78 | public void autoConnectsToSourceAfterASpecifiedNumberOfConnections() throws Exception { 79 | TestSubscriber subscriber1 = TestSubscriber.create(); 80 | TestSubscriber subscriber2 = TestSubscriber.create(); 81 | Observable observable = defer(() -> just(Instant.now())) 82 | .doOnNext(i -> logger.info(i.toString())) 83 | .publish().autoConnect(2); 84 | observable.subscribe(subscriber1); 85 | observable.subscribe(subscriber2); 86 | 87 | subscriber1.assertValueCount(1); 88 | subscriber1.assertCompleted(); 89 | subscriber2.assertValueCount(1); 90 | subscriber2.assertCompleted(); 91 | assertThat(subscriber1.getOnNextEvents().get(0)) 92 | .isEqualTo(subscriber2.getOnNextEvents().get(0)); 93 | } 94 | } 95 | -------------------------------------------------------------------------------- /src/test/java/MultiThreading.java: -------------------------------------------------------------------------------- 1 | import org.junit.Test; 2 | import rx.Observable; 3 | import rx.functions.Action1; 4 | import rx.functions.Func1; 5 | import rx.observers.Observers; 6 | import rx.observers.TestSubscriber; 7 | import rx.schedulers.Schedulers; 8 | 9 | import java.util.concurrent.Callable; 10 | 11 | public class MultiThreading { 12 | @Test 13 | public void runsInBlockingManner() throws Exception { 14 | Observable.fromCallable(thatReturnsNumberOne()) 15 | .map(numberToString()) 16 | .subscribe(printResult()); 17 | 18 | } 19 | 20 | @Test 21 | public void runsObservableOnADifferentThread() throws Exception { 22 | Observable.fromCallable(thatReturnsNumberOne()) 23 | .subscribeOn(Schedulers.newThread()) 24 | .map(numberToString()) 25 | .subscribe(printResult()); 26 | 27 | } 28 | 29 | @Test 30 | public void runsSubscriberOnADifferentThread() throws Exception { 31 | TestSubscriber testSubscriber = TestSubscriber.create(Observers.create(printResult())); 32 | 33 | Observable.fromCallable(thatReturnsNumberOne()) 34 | .map(numberToString()) 35 | .observeOn(Schedulers.newThread()) 36 | .subscribe(testSubscriber); 37 | 38 | testSubscriber.awaitTerminalEvent(); 39 | } 40 | 41 | @Test 42 | public void runsOperatorOnADifferentThread() throws Exception { 43 | TestSubscriber testSubscriber = TestSubscriber.create(Observers.create(printResult())); 44 | 45 | Observable.fromCallable(thatReturnsNumberOne()) 46 | .observeOn(Schedulers.newThread()) 47 | .map(numberToString()) 48 | .subscribe(testSubscriber); 49 | 50 | testSubscriber.awaitTerminalEvent(); 51 | } 52 | 53 | @Test 54 | public void runsObservableOperatorAndSubscriberOnDifferentThreads() throws Exception { 55 | TestSubscriber testSubscriber = TestSubscriber.create(Observers.create(printResult())); 56 | 57 | Observable.fromCallable(thatReturnsNumberOne()) 58 | .subscribeOn(Schedulers.newThread()) 59 | .observeOn(Schedulers.newThread()) 60 | .map(numberToString()) 61 | .observeOn(Schedulers.newThread()) 62 | .subscribe(testSubscriber); 63 | 64 | testSubscriber.awaitTerminalEvent(); 65 | } 66 | 67 | private Action1 printResult() { 68 | return result -> { 69 | System.out.println("Subscriber thread: " + Thread.currentThread().getName()); 70 | System.out.println("Result: " + result); 71 | }; 72 | } 73 | 74 | private Func1 numberToString() { 75 | return number -> { 76 | System.out.println("Operator thread: " + Thread.currentThread().getName()); 77 | return String.valueOf(number); 78 | }; 79 | } 80 | 81 | private Callable thatReturnsNumberOne() { 82 | return () -> { 83 | System.out.println("Observable thread: " + Thread.currentThread().getName()); 84 | return 1; 85 | }; 86 | } 87 | } 88 | -------------------------------------------------------------------------------- /src/test/java/QuickIntroduction.java: -------------------------------------------------------------------------------- 1 | import org.junit.Test; 2 | import rx.Observable; 3 | import rx.Subscriber; 4 | 5 | public class QuickIntroduction { 6 | @Test 7 | public void verboseVersion() throws Exception { 8 | Observable source = Observable.range(1, 5); 9 | 10 | Subscriber consumer = new Subscriber() { 11 | @Override 12 | public void onNext(Integer number) { System.out.println(number); } 13 | 14 | @Override 15 | public void onError(Throwable e) { System.out.println("error"); } 16 | 17 | @Override 18 | public void onCompleted() { System.out.println("completed"); } 19 | }; 20 | source.subscribe(consumer); 21 | } 22 | 23 | @Test 24 | public void conciseVersion() throws Exception { 25 | Observable.range(1, 5).subscribe( 26 | number -> System.out.println(number), 27 | error -> System.out.println("error"), 28 | () -> System.out.println("completed") 29 | ); 30 | } 31 | } 32 | -------------------------------------------------------------------------------- /src/test/java/ResilienceTests.java: -------------------------------------------------------------------------------- 1 | import org.junit.Before; 2 | import org.junit.Test; 3 | import org.mockito.Mockito; 4 | import rx.Observable; 5 | import rx.observers.Subscribers; 6 | import rx.observers.TestSubscriber; 7 | 8 | import java.io.IOException; 9 | 10 | import static org.mockito.Mockito.mock; 11 | import static org.mockito.Mockito.when; 12 | 13 | public class ResilienceTests { 14 | 15 | private Service mockService; 16 | private TestSubscriber subscriber; 17 | 18 | @Before 19 | public void setUp() throws Exception { 20 | mockService = Mockito.mock(Service.class); 21 | subscriber = TestSubscriber.create(Subscribers.create( 22 | System.out::println, 23 | e -> System.out.println("Error: " + e.getMessage()), 24 | () -> System.out.println("Done") 25 | )); 26 | } 27 | 28 | @Test 29 | public void handlesErrorUsingOnError() throws Exception { 30 | when(mockService.processRequest()).thenThrow(new IOException("IO Error")); 31 | 32 | 33 | Observable.fromCallable(mockService::processRequest) 34 | .subscribe(subscriber); 35 | 36 | subscriber.awaitTerminalEvent(); 37 | subscriber.assertNoValues(); 38 | subscriber.assertNotCompleted(); 39 | subscriber.assertError(IOException.class); 40 | } 41 | 42 | @Test 43 | public void handlesErrorByReturningSomeValue() throws Exception { 44 | when(mockService.processRequest()).thenThrow(new IOException("IO Error")); 45 | 46 | Observable.fromCallable(mockService::processRequest) 47 | .onErrorReturn(e -> "default") 48 | .subscribe(subscriber); 49 | 50 | subscriber.awaitTerminalEvent(); 51 | subscriber.assertValue("default"); 52 | subscriber.assertCompleted(); 53 | subscriber.assertNoErrors(); 54 | } 55 | 56 | @Test 57 | public void handlesErrorBySubscribingToAnotherObservable() throws Exception { 58 | when(mockService.processRequest()) 59 | .thenThrow(new IOException("IO Error")); 60 | 61 | Service anotherService = mock(Service.class); 62 | when(anotherService.processRequest()).thenReturn("result"); 63 | 64 | Observable.fromCallable(mockService::processRequest) 65 | .onErrorResumeNext(Observable.fromCallable(anotherService::processRequest)) 66 | .subscribe(subscriber); 67 | 68 | subscriber.awaitTerminalEvent(); 69 | subscriber.assertValue("result"); 70 | subscriber.assertCompleted(); 71 | subscriber.assertNoErrors(); 72 | } 73 | 74 | private interface Service { 75 | String processRequest() throws IOException; 76 | } 77 | 78 | } 79 | -------------------------------------------------------------------------------- /src/test/resources/logback.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | %d{HH:mm:ss.SSS} [%thread] - %msg%n 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | --------------------------------------------------------------------------------